L 16 ] 



Yemen, its natural products, 573 



575. 

 Young, Robert, his discoveiy of the 



interference of light, 716, 727. 



Zeni, the Fratelli, travels of, 611. 

 Zodiacal light, its discovery and scien* 



tific results, 712, 713. 

 Zuniga, Juana de, wife of Cortez, 



647, 648. 



LONDON : 

 BY HARRISON AND SON, ST. MARTIN'S LANS. 



